Burglar-alarm



(No Model.)

No. 583,543. Paented June 1, 1897.

"mull" UNITED STATES PATENT UEEICE.

GEORGE IV. NELSON, OF FIVE FORKS, PENNSYLVANIA.

BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent N 0. 583,543, dated June 1, 1897. Application filed December 10, 1896. Serial No. 615,145. (No model.)

To ail whom it may concern:

Be it known that I, GEORGE W. NELSON, a citizen of the United States, residing at Five Forks, in the county of Franklin and State of Pennsylvania, have invented certain new and useful Improvements in Burglar-Alarms; and I do declare the following to be a full,clear,and exact description of the invention, suchas will enable others skilled in the art to which it appertains to make and use the same.

My invention has relation to burglaralarms; and the object is to provide a springgun of this class for the outside of dwellings, residences, and the like, to give an audible alarm and notify the occupants of the presence of intruders.

To this end the novelty consists in the construction, combination, and arrangement of the same as will be hereinafter more fully described, and particularly pointed out in the claims.

In the accompanying drawings the same reference-numerals indicate the same parts of the invention.

Figure 1 is a perspective view of my improved burglar-alarm. Fig. 2 is a longitudinal section showing the hammer locked to prevent the accidental tripping of the alarm, and Fig. 3 is a detail showing the breechblock thrown back to insert the cartridge.

1 represents a suitable base-block having an integral standard 2, its upper end terminating in bifurcated jaws in which is fulcrumed the hammer-lever 3, its forward or free end terminating in a hammer-head 4 and its rear end provided with a pin 5, which projects under a trigger 6, extending radially from the'hub 7, journaled on a vertical stud 8, mounted in the base-block. This hub is secured in place on the stud by a transverse pin 9, so as to permit a free horizontal rotation of said hub.

10 10 represent a series of radial horizontal integral arms on said hub, and their outer ends are formed with eyes 11, in each of which is secured one end of a cord or wire 12, the opposite end thereof being made fast in the same horizontal plane to any stationary object.

13 is a spiral spring secured at its upper end to the hammer end of the lever 3 and its lower end to an eye 14 in the base-block.

The rear end of the horizontal arm 23 of said lever 20 is provided with a vertical stud 24, located immediately below and in the path of the descending hammer-head 4.

25 represents a transversely-pivoted vertical pawl, the upper end of which engages a detent- 26 in the hammer-lever to sustainitin a cooked position and prevent its accidental release. When the alarm is to be put in operation, this pawl is pushed to one side and the hammer-lever held in place by the pin 5, engaging the under side of the radial trigger 6, and when so adjusted the least movement of the hub 7 on its axis will cause its trigger to release the pin, thereby permitting the spring to draw the hammer down on the stud 24 to explode the cartridge.

In practice the alarm may be placed on a porch or any suitable spot on the lawn or yard,

and the leading cords or Wires run to suitable points-as, for instance,one may be connected to a gate or door opening outwardly, while the remaining cords or wires radiate in different directions about six inches above the ground and their outer ends made fast to the fence or a peg driven in theground for that purpose. When so arranged, a person crossing the path of any one of the wires or opening the gate will rotate the hub sufficiently to release the pin 5 and explode the cartridge. If desirable, one of the wires may be led at a right angle from anappropriate arm on the hub in line with the cartridge-barrel and a ball-cartridge inserted, the explosion of which by that particular wire is almost certain to maim the intruder about the lowerportion of the legs.

Although I have specifically described the construction and relative arrangement of the several elements of my invention, I do not desire to beconfined to the same, as such changes or modifications may be made as clearly fall Within the scope of my invention, Without departing from the spirit thereof.

Having thus fully described my invention, what I claim as new and useful, and desire to secure by Letters Patent of the United States,

1. A burglar alarm, comprising the cartridge-barrel, the pivoted breech-block and the lever 20 provided with the anvil 22, and the stud-arm 23, in combination with the pivoted hammer-lever, the spring, and the pin 5, the horizontally-rotating hub 7 provided with the integral radial trigger 6 and radial arms 10 10, substantially as shown and described.

2. A burglar-alarm, comprising the basetally block having the integral cartridge-barrel and the pivoted breech-block, the lever 20, pivoted in said breech-block and provided with an integral anvil 22, and a vertical stud 24, the hammerlever fulcrumed between integral standards arising from the base-block, the spring connecting said 11am mer-lever and base-block, and the pin 5 projecting horizonfrom the rear end of said hammer-lever, in combination with the horizontally-rotating hub 7 provided with an integral trigger and integral radial arms, substantially as shown and described.

In testimony whereof I hereunto affix my signature in presence of two witnesses.

GEORGE IV. NELSON. \Vitnesses:

GEO. E. TERRY, A. B. SUIT. 

